Sliding Glass Patio door- no markings aluminum - bit older construction

A handy person from utah says:
Please help identify what this wheel assembly is.
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Bob from SWISCO responded:

Thanks for posting. The 81-157 and 81-181 come to mind, but I can't be certain if we have an exact match without knowing the height and thickness of the assembly, as well as the diameter of the wheels. From there, we'll do our best to confirm our closest match. Many thanks.

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